Dental impression-pliers.



No. 869,520. PATENTED OCT. 29, 1907. M. A. ROBBINS.

DENTAL IMPRESSION PLIERS.

APPLIUATION FILED DBO.16,1906.

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UNITED STATES MYRON A. ROBBINS, OF PASSAIC, NEW JERSEY.

DENTAL IMPRESSION-PLIERS.

Specification of Letters Patent.

Patented Oct. 29, 1907.

Application filed December 15. 1906- Serial No. 348,078.

To all whom it may concern:

Be it known that I, MynoN A. Ronnixs, a citizen of the United States,residing at Iassaic, in the county of Iassaic and State of New Jersey,have invented certain new and useful Improvements in Dental Impression-Iliers; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The present invention relates in general to dentistry, and has for itsprimary object to provide a novel means whereby a patient will beenabled to hold an impres sion cup in his mouth a considerable length oftime without gagging to an appreciable extent, or his nerves becominggreatly excited.

Where an impression of the roof of the mouth is being taken in thecustomary manner the nerves of the patient frequently become so excitedthat he has an uncontrollable tendency to close his jaws and therebycause a false impression to be taken.

In order to obviate this dilliculty the present invention comprisesbroadly a cushioning means interposed between the impression cup and thelower jaw whereby the patient is enabled to move his lower jaw and bearupwardly with the same against the cushioning means without shifting theposition of the impression cup.

With these and other objects in view the invention comprises certainnovel constriutions combinations and arrangements of parts as will behereinafter more fully described and claimed.

In the accompanying drawingsz-Figure 1 is a side elevation showing theapplication of the invention. Fig. 2 is a top plan view of theimpression pliers. Fig. 3 is a side elevation of the pliers, portionsthereof being shown in section.

The cushioning means comprising the present invention is shown in thenature of a pair of pliers formed of a pair of complemental members 1and 2 which are pivotally connected at an intermediate point to form thehandles 3 and 4- and the oppositely disposed jaws 5 and 6. The lower jaw5 comprises a pair of spaced and approximately parallel arms, 7, havingtheir extremities bent slightly downward at S and formed withtransversely disposed bearing members f) adapted to [it against theteeth upon opposite sides of the lower jaw as disclosed in Fig. 1. Theupper jaw ('5 is-bent slightly inwardly at 10 and is positioned betweenthe spaced arms 7 of the lower jaw. At the extremity of the upper jaw 10there is located a knob '11 which is adapted to bear againstanimpression cup such as indicated at 26 in Fig. 1 and preferably fitswithin the depression in the base of the said cup. In the preferred formof the invention this knob 11 is formed of some yielding material suchas rubber and is detachably connected to the pliers by means of anintegral stem 12 fittingremovably in an opening 13 at the extremity ofthe upper jaw 6.

In the specific construction of the complemental member 1, it will beobserved that the same is broad encd out at an intermediate pointforming the spaced portions 1 1 connected by the pivot pin 15 upon whichthe complemental member 2 is mounted. A convenient method ofaccomplishing this result is by forming the member 1 of two flat stripswhich are secured to each other throughout the greater portion of theirlength but are spread apart at an intermediate point to form the spacedportions 1 1. The complcmental member 2 is also broadened at anintermediate point as indicated at 16 and is provided with the cars 17by means of which it is pivotally mounted upon the pin 15. Immediatelyto the rear of the car 17 an offset portion 18 is formed in thecomplemental member 2 which passes through the opening between thespaced portions 1 1 of the member 1 and causes the handle 4 and jaw 5 ofthe member 2 to lie upon opposite sides of the member 1. In the form ofthe invention shown in the drawings the complemental member 1 is formedof sheet material and the handle 1 has a concave upper surface for thereception of the thumb of the operator and also has a reinforcing rib 19stamped therefrom. The arms 7 of the jaw 5 may also be reinforced bygiving the same a concave formation as indicated at 20 if desired.

In order to force the jaws 5 and 6 apart a spring 21 is employed whichis shown as in the nature of a coil spring carried by the pivot pin 15.

A catch 22 is provided for locking the jaws of the pliers in a closedposition when the implement is being applied to a patient, and thiscatch is pivotally connected to the handle 3 so as to engage with theextremity of the handle 1 in such a manner as to be readily disengagcdthere fro m by the finger of the operator while handling the instrument.Attention is also directed to the fact that a rib or enlarged portion 23extends along the outer edge of the handle 3, the inner end of the ribterminating in a projection 2-1. In the use of the pliers the lingers ofone hand of the operator bear against the enlarged portion 23 of thehandle 3 and are prevented from slipping longitudinally thereon by meansof the projection 24, while the thumb fits within the depressed portionof the opposite handle 1. It will thus be apparent that by a slightmotion of the thumb the catch 22 can be disengaged from the handle 1 andby properly manipulating the handle of the instrument the action of thejaws can be controlled.

In order to protect the spring 2| it may be found desirable to employ acovering plate 25 connecting the forward portions of the spaced members11 of the coinplemental member 1.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent 1. A device of the character described,comprising a pair of loosely connected jaws, one of which is formed withtwo spaced arms provided at their extremities with transversely disposedbearing members, while the opposite jaw is positioned between the spacedarms and provided with a knob for engaging an impression cup 2. A deviceof the character described, comprising cornplemental members pivotallyconnected to form handles and jaws, one of the jaws being provided withspaced bearing means and the opposite jaw with means [or engaging animpre sion cup.

J. A device of the character described, comprising eom plemental member"pivotally connected to form handles and jaws, one of-said jaws beingpivoted with bearing means and the opposite jaw with means for animpression cup, means for forcing the two jaws apart, and means forlocking the jaws together.

4. A device 01' the character described, comprising coinplementalmembers pivotally connected to form handles engaging and jaws, anenlarged rib extending along the outer edge oi one of the handles, and aprojection cooperating with the rib to enable a firm grip to be obtainedupon the handle without danger oi. slippin A device of the characterdescribed, comprising complemental members pivotally connected to formjaws and handles, spaced bearing means and means for engaging animpression cup carried respectively by the jaws, means normally actingto force the jaws apart, and a catch carried by one of the handles andengaging the extremity of the opposite handle to hold the jaws together.

6. In a dental instrument, crossed and pivoted handle members, a jawmember carried by one handle member and comprising spaced bearing arms,and a single arm carried by the other jaw member spaced between thebearing members and carrying a resilient knob.

In testimony whereof I ai'lix my signature in presence of two witnessesMYRON A. ROBBINS.

Witnesses T1 1031 s I. Cos'ri-zilno, Enxnsr E. Twls'r.

